netdev - Re: [PATCH v4 2/4] crypto/net/tcp: Use crypto

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Date:   Thu, 19 Jan 2023 17:58:53 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andy Lutomirski <luto@...capital.net>,
        Bob Gilligan <gilligan@...sta.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Leonard Crestez <cdleonard@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Salam Noureddine <noureddine@...sta.com>,
        netdev@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH v4 2/4] crypto/net/tcp: Use crypto_pool for TCP-MD5

On Wed, Jan 18, 2023 at 09:41:09PM +0000, Dmitry Safonov wrote:
> Use crypto_pool API that was designed with tcp_md5sig_pool in mind.
> The conversion to use crypto_pool will allow:
> - to reuse ahash_request(s) for different users
> - to allocate only one per-CPU scratch buffer rather than a new one for
>   each user
> - to have a common API for net/ users that need ahash on RX/TX fast path
> 
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>  include/net/tcp.h        |  24 +++------
>  net/ipv4/Kconfig         |   1 +
>  net/ipv4/tcp.c           | 104 ++++++++++-----------------------------
>  net/ipv4/tcp_ipv4.c      | 100 +++++++++++++++++++++----------------
>  net/ipv4/tcp_minisocks.c |  21 +++++---
>  net/ipv6/tcp_ipv6.c      |  61 +++++++++++------------
>  6 files changed, 135 insertions(+), 176 deletions(-)

I think the best option for the legacy tcp md5 code is to move
md5 over to lib/crypto like sha1 and invoke it that way.

Going through the generic Crypto API when you use a single algorithm
in synchronous mode is pointless.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt